单选题 1分

tablets 药片are placed in the______ and require replacement as they are used up.

  • A. waste water inlet
  • B. chlorinator ;氯化器
  • C. settling compartment
  • D. aeration compartment

你可能感兴趣的试题

3 单选题 1分
  • A. to provide a solution of lowering pollution at sea
  • B. to specify minimum standards for the members composing the watch at sea
  • C. to specify minimum standards for ships considering their safety
  • D. to tell the company how to go about running their business
4 单选题 1分
  • A. Overload protection
  • B. Interlock protection
  • C. Short circuit protection
  • D. Zero-voltage protection
5 单选题 1分
  • A. are exposed to a vacuum
  • B. come in contact with extremely hot surfaces
  • C. are reduced in temperature to just above the pour point
  • D. become extremely agitated or aerated